Many stages selector switch is a multi-purpose products&comma; from the power switch CNC control panel&comma; can be widely used&period; The power switch&comma; due to the use of high voltage&comma; itself is high current so should use the silver contact alloy in the control panel&comma; because of the CNC itself is low voltage and low current so should use&comma; due to the different gold joints shall use for products&comma; and distinguish between pathologic will clearly marked likelihood ratio increases damage to the disciples&comma; or contact adverse circumstances&comma; in this company is introduced&comma; the more suitable type&comma; don't force&comma; in blue and white&sol;zone between two colors of high voltage and low voltage&comma; high current and low current period can achieve the effect of work&comma; and improve the service life of product&period;